Aerial propeller



Dec. 9, 1 24. 1,518,846

A. HARPER ET AL AERIAL- PROPELLER Filed Oct. lQ, 1923 Patented Dec, 9, 1924-.

UNITED STATES PATENT QFFICE.

ALEXANDER HARPER AND STEWART ALEXANDER HARPER, OF DUNEDIN, OTAGO, NEV] ZEALAND.

AERIAL PROPELLER.

Application filed October 10, 1923.

To all whom it may concern.

Be it known that we, ALEXANDER HARPER and STEWART ALEXANDER HARPER, both Subjects of King George V of Great Britain, residing at 40 Dowling Street, Dunedin, Otago, in the Dominion of- New Zealand, have invented certain new and useful Improvements in Aerial Propellers, of which the following is a specification.

This invention relates principally to aviation.

The obj cct of the invention is to produce a rotatable helical member, adapted when rotating horizontally in the air, to induce a direct lift.

Another object is to provide stabilizing means for vessels afloat, hydro-planes and the like machines.

The helical member consists of a boss part and members projecting therefrom (hereinafter referred to as the body members) and aerofoils (hereinafter referred to as wings) projecting from the said body part.

According to this invention the body members projecting are diametrically opposite, and a portion of their surface equal to the width of the wings, is so fashioned that when the wings are secured to the said surface they have an angle of incidence, and project at rigl'it angles to the body part in adverse directions, the wings forming a dihedral angle.

0 have described a helical member in its single form; there may be a series of these members to increase the lifting capacity; if more than one is used they will be interposed, the whole rotating in the same direction.

Referring to the accompanying drawings,

Figure 1 is a perspective view showing a pair of helical members.

Serial No. 667,744.

F igure 2 is a plan View of one of the members shown in Figure 1.

Figure 3 is an end view of Figure 2, looking in the direction of the arrow-head Z.

Figure 4 is a side view of Figure 2. looking in the direction of the arrow-head Y.

F igure 5 is a section through A-B, Figure 2. V

Figure 6 is a section through (E -l Figure 2.

Referring to the numerals on the drawing, 1 indicates the boss; 2 and 3 the projecting members of the body part. There is a hole t provided in the boss 1, to fix the helical members to the propeller shaft of an engine (not shown in the drawings) the wings of the said helical members are indicated at 5 and 6, the said wings being suitably fixed to the projecting member, as indicated at 7.

Whatwe claim as new and desire to secure by Letters Patent is An aerial propeller including a boss and members projecting therefrom, and wings ecured to each of said members, said members being diametrically opposed and having that portion of their lengths equal to the width of the wings so constructed that with the wings in place such wings have an angle of incidence project at right angles to the body part in reverse directions, and form a dihedral angle.

In testimony whereof we afliX our signatures.

ALEXANDER HARPER STE-VVART ALEXANDER HARPER.

lVitnesses JOHN THOMPSON, NrrA EVANS. 

